KR101383704B1 - Circuit board and display device including the same - Google Patents

Abstract

The present invention relates to a circuit board on which a differential signal line is formed, and includes a base plate and a plurality of differential signal lines formed on the base plate and transferring differential signals. Each of the plurality of differential signal lines includes a first signal line and a second signal line, wherein the first signal line and the second signal line extend along at least two paths parallel to each other, and the first signal line and the second signal line. The path changing unit changes the path, and the path changing units of the neighboring differential signal lines are located at different positions along the length direction of the differential signal line. This can improve EMI characteristics.

Display Device, Circuit Board, Differential Signal Line, Path Changer, Via Hole

Description

Circuit board and display device including the same {Circuit board and display device including the same}

The present invention relates to a circuit board and a display device including the same, and more particularly, to a circuit board on which a differential signal line is formed and a display device including the same.

Flat panel displays include liquid crystal displays, plasma display panels, flat emission displays, fluorescent fluorescent displays, and organic light emitting displays ( organic light emitting display).

Such display devices typically include a display panel and a signal controller for supplying signals to the display panel. The display panel receives a signal through a flexible printed circuit connected to the signal controller. The signal controller includes a timing controller (TCON), an integrated circuit chip, and the like, which are connected with wiring arranged on the same layer or another layer. The flexible printed circuit film includes a film, a plurality of wirings arranged side by side on the film and a protective film formed on the plurality of wirings.

As display devices become larger and higher in quality, core semiconductors such as integrated circuit chips and TCON are becoming increasingly complex. Accordingly, various technical problems are required to be improved. In particular, in order to prevent image degradation due to noise and signal delay, improvement of a data transmission method is urgently required.

For example, the TTL (transistor-to-transistor), which is a data transmission method between the LCD driver ICs (LDI) in the conventional TCON, has a low signal transmission rate, high current consumption, and poor electromagnetic interference (EMI) characteristics. Complementary methods are low voltage differential signaling (LVDS) or reduced signal differential signaling (RSDS), which reduces the swing size of a signal in the conventional TTL scheme, thereby improving EMI characteristics and improving signal transmission speed. In addition, fewer wires can be used in the TTL method. Recently, interface technologies such as mini-LVDS and point-to-point differential signaling (PPDS) have been studied.

However, in the case of the LVDS or RSDS scheme, the EMI characteristic may be improved in the low frequency band, but the EMI characteristic is not significantly improved in the high frequency band. For example, the wireless wide area network and the wireless local area network use a high frequency range of 800 MHz to 6 GHz, and in this frequency range, even if the LVDS or RSDS method is used, the EMI The property is not greatly improved. In order to improve the image quality of the display device, EMI must be reduced.

Accordingly, the present invention provides a circuit board capable of reducing EMI in a low frequency band as well as a high frequency band and a display device including the same.

A circuit board according to an embodiment of the present invention is formed on a base plate and a base plate and includes a plurality of differential signal lines for transferring differential signals. Each of the plurality of differential signal lines includes a first signal line and a second signal line, wherein the first signal line and the second signal line extend along at least two paths parallel to each other, and the first signal line and the second signal line. The path changing unit changes the path, and the path changing units of the neighboring differential signal lines are located at different positions along the length direction of the differential signal line.

The base plate may include a first surface and a second surface, the at least two paths may include a first path located on the first surface and a second path located on the second surface, The first signal line may be located on the first path on one side and the second path on the other side of the path changing unit, and the second signal line may be located on a path opposite to the first signal line. .

The base plate may include a pair of via holes positioned in the path changing unit, and the first signal line and the second signal line may change a path from the first path to the second path through the pair of via holes. Can be.

The first path and the second path may overlap.

The pair of via holes may be spaced apart from the first path and the second path. The pair of via holes may be spaced apart from each other with respect to the first and second paths, where they may face each other.

The planar shape of the first signal line and the second signal line part positioned in the path changing part may be a rhombus.

When the first path is projected onto the second surface of the base plate, the first path and the second path may be spaced apart from each other.

The pair of via holes may be located on the first path and the second path, respectively, and the first signal line and the second signal line may cross each other at the path changing unit.

The planar shape of the first signal line and the second signal line part positioned in the path changing part may be a cross.

The path changing part of the differential signal line may face the center of a section between two adjacent path changing parts of the neighboring differential signal line.

The base plate may include a first surface and a second surface, and a plurality of via holes spaced apart from the path changing part in a length direction of the differential signal line.

The at least two paths may include a first path located on the first surface, a second path located on the second surface and overlapping with the first path, and a second path located on the first surface and spaced apart from the first path. A third path and a fourth path located on the second surface and overlapping the third path,

The first signal line may be changed from the first path to the third path while passing through the path changing unit, and may be changed from the third path to the fourth path at the via hole, and may be identical to the first signal line. The second signal line may be changed from the fourth path to the second path while passing through the path change unit, and may be changed from the second path to the first path at the via hole.

The first signal line and the second signal line may cross each other in the path changing part, and the planar shape of the first signal line and the second signal line part positioned in the path changing part may be cross.

Via holes corresponding to two neighboring differential signal lines on the same surface of the base plate may be located at different locations along the length direction of the differential signal line. Furthermore, path changing parts and via holes corresponding to two neighboring differential signal lines on the same surface of the base plate may be located at different locations along the length direction of the differential signal line.

The base plate may be formed of a double layer including an upper layer and a lower layer. In this case, the at least two paths may include a first path located on the upper layer and a second path located on the lower layer. The signal line may be located in the first path on one side and the second path on the other side of the path changing unit, and the second signal line may be located in a path opposite to the first signal line. have.

The upper layer may include a pair of via holes positioned in the path changing unit, and the first and second signal lines may change a path from the upper layer to the lower layer through the pair of via holes.

The base plate and the differential signal line may have flexibility.

A display device according to an exemplary embodiment of the present invention includes the circuit board described above, a gate and data driving integrated circuit chip receiving a signal from the circuit board, and a plurality of thin film device structures on the substrate. A display panel receives a signal from a circuit chip.

According to an exemplary embodiment of the present invention, EMI can be reduced not only in the low frequency band but also in the high frequency band, and further, a phenomenon in which the image quality of the display device is degraded due to noise such as EMI can be prevented.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The flexible printed circuit film according to the embodiment of the present invention can be applied to various display devices such as a liquid crystal display device, a plasma display device, a field emission display device, a fluorescent display panel, and an organic light emitting display device. In the accompanying drawings, a liquid crystal display is illustrated and an exemplary embodiment of the present invention is described based on this, but the display device according to the exemplary embodiment of the present invention is not limited to the liquid crystal display.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. It will be understood that when an element such as a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the element directly over another element, Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

Next, a circuit board and a display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

1 is a perspective view of a display device according to an exemplary embodiment of the present invention, FIG. 2 is an example of a partially enlarged plan view of the circuit board illustrated in FIG. 1, FIG. 3 is an enlarged view of portion A of FIG. 2, and FIG. 4. Is another example of a partially enlarged plan view of the circuit board shown in FIG.

Referring to FIG. 1, the display device according to the present exemplary embodiment includes a panel unit 300, a flexible printed circuit film 510, and a circuit board 450.

The display panel unit 300 includes a lower panel 100, an upper panel 200, and an electro-optic layer (not shown). However, the display panel unit 300 may include only one display panel or may include three or more display panels.

The lower panel 100 includes a substrate and a thin film device structure thereon. The substrate is made of a transparent insulating material such as glass or plastic. The thin film device structure includes a pixel electrode, a thin film transistor, various signal lines, etc., which are made of a conductor and an insulator. Although not shown in the figure, an example of the structure of the lower panel 100 will be briefly described.

A plurality of gate lines are formed on the lower substrate. A gate insulating layer, a semiconductor, and an ohmic contact are sequentially formed on the gate line, and a data line and a drain electrode are formed thereon. The gate line includes a plurality of gate electrodes, the data line includes a plurality of source electrodes, and the gate electrode, the semiconductor, the source electrode, and the drain electrode form a thin film transistor. A passivation layer is formed on the semiconductor, the data line, the drain electrode, and the gate insulating layer, and a plurality of pixel electrodes are formed on the passivation layer. The pixel electrode is connected to the drain electrode through a contact hole formed in the protective film.

The upper panel 200 faces the lower panel 100 and is smaller than the lower panel 100 so that a part of the edge of the lower panel 100 is not covered by the upper panel 200. The upper display panel 200 includes a substrate and a thin film structure. The substrate is made of a transparent insulating material such as glass or plastic. The thin film structure includes a common electrode, a color filter, a light blocking member, and the like, which are made of a conductor and an insulator. Although not shown in the drawings, an example of the structure of the upper panel 200 will be briefly described.

A light shielding member is formed on the substrate. The light blocking member has a plurality of openings facing the pixel electrode and having substantially the same shape as the pixel electrode, and prevents light leakage between the pixel electrodes. An overcoat is formed on the substrate and the light shielding member, and a common electrode is formed on the cover film. A plurality of color filters are formed between the substrate and the protective film. Each color filter is mostly present in the opening of the light shielding member and can display one of primary colors such as red, green, and blue.

The structures of the lower panel 100 and the upper panel 200 are merely examples and various modifications are possible. For example, at least one of the common electrode, the color filter, and the light blocking member may be included in the lower panel 100. The lower panel 100 may further include a storage electrode.

The electro-optical active layer is disposed between the lower panel 100 and the upper panel 200. When the panel 300 includes only one panel, the panel is positioned on the panel. The material of the electro-optical active layer varies depending on the type of display device. For example, the electro-optical active layer may be a liquid crystal material in the case of a liquid crystal display, or an organic light emitting material in the case of an organic light emitting display.

The circuit board 450 exports a plurality of image signals, data signals, and gate signals to the gate driving integrated circuit chip and the data driving integrated circuit chip. Differential signals are used as signals to the gate driving integrated circuit chip and the data driving integrated circuit chip. Differential signal transmission can be used for LVDS, RSDS, mini-LVDS and PPDS methods. The circuit board 450 will be described in more detail with reference to FIGS. 2 and 3.

The flexible printed circuit film 510 may include a film, a metal wiring formed thereon, and a protective film formed on the metal wiring. One end of the flexible printed circuit film 510 is attached to the exposed edge portion of the lower panel 100 through the conductive adhesive 570, and the other end is connected to the circuit board 450 through the conductive adhesive 570. ) Is attached. The conductive adhesive 570 is a kind of anisotropic conductive film. The metal wiring, the lower panel 100, and the circuit board 450 formed on the flexible printed circuit film 510 through the conductive particles mixed therewith are formed. The wiring of is electrically connected.

The gate / data driving integrated circuit chip may be formed on the flexible printed circuit film 510 (TCP method) or may be formed on the display panel unit 300 (COG / FOG method). The signal received from the circuit board 450 is transferred to the gate / data driving integrated circuit chip through the metal wire of the flexible printed circuit film 510. The gate driving integrated circuit chip applies a gate-on voltage to the gate line to turn on the switching element connected to the gate line, and the data driving integrated circuit chip selects a gray scale voltage corresponding to each digital image signal to convert the digital image signal into analog data. Generate it as a voltage and apply it to the data line.

The illumination unit 80 is disposed below the display panel unit 300 and the lid 60 is disposed above the display panel unit 300. The display panel unit 300 can be stably fixed to the illumination unit 80 using the lid 60. [

The lighting unit 80 may include a light source such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) or a light source such as a light emitting diode (LED), a light guide plate, and a reflective member. The light guide plate guides the light emitted from the light source, and the reflective member directs the light reflected from the light guide plate toward the display panel unit 300 to minimize the light loss.

2 and 3, the circuit board 450 may include a substrate 451, a plurality of integrated circuit chips 460, a TCON 470, and a plurality of differential signal lines 420. It includes.

The base plate 451 may be made of phenol resin or epoxy resin, and may have flexibility when the base plate 451 is moved or requires bending.

On the base plate 451, an integrated circuit chip 460 for graphic processing and the like and a TCON 470 for converting signals input from the integrated circuit chip 460 into various control signals required for gate / data driving integrated circuit chip driving are provided. Formed.

A plurality of differential signal lines 420 are also formed on the base plate 451. One differential signal line 420 includes a first signal line 422 and a second signal line 424. The first signal line 422 and the second signal line 424 each include a portion placed in the first path 10 and a portion placed in the second path 20 and transmit signals having the same amplitude and opposite phases. . In this case, the receiving circuit responds only to the voltage difference between the two signal lines 422 and 424. Here, the first path 10 is located on the top surface of the base plate 451, the second path 20 is located on the bottom surface of the base plate 451, and the first path 10 is referred to as the second path 20. The two paths 10 and 20 overlap with each other when projected on the lower surface of the base plate 451 where) is located.

A plurality of via holes 455 are formed in the base plate 451, and the via holes 455 are disposed in pairs in the path change unit PCP. The pair of via holes 455 are opposite to each other with respect to the paths 10 and 20 and face each other. The path change unit PCP is a portion in which the paths of the first and second signal lines 422 and 424 are changed, and are repeatedly positioned along the length direction L of the differential signal line 420.

When the two adjacent via holes 455 along the longitudinal direction L of the differential signal line 420 are referred to as sections S1 and S2, the distances of the sections S1 and S2 may be the same, and each section may be the same. It may be different.

When the first signal line 422 moves along the longitudinal direction L, the portion placed in the first path 10 and the portion placed in the second path 20 alternately appear, and the second signal line 424 also has its length direction. When moving along (L), the portion placed in the first path 10 and the portion placed in the second path 20 appear alternately. In the same period S1 and S2, the first signal line 422 and the second signal line 424 are located on opposite paths. That is, in the section in which the first signal line 422 is in the first path 10, the second signal line 424 is located in the second path 20, and the first signal line 422 is in the second path 20. In the section, the second signal line 424 is located in the first path 10. The position of the first signal line 422 and the second signal line 424 is changed to the first path 10 or the second path 20 through the via hole 455.

Looking at the position of the first and second signal lines 422 and 424 along the direction of the second section S2 in the first section S1, and more specifically, the first signal line 422 may include the first section S1. ) Is changed from the first path 10 to the second path 20 through the via hole 455 located at the beginning of the path, and then the second path 20 to the via hole 455 located at the end of the first section S1. ) The first signal line 422 changes its position to the first path 10 again through the via hole 455 located at the end of the first section S1 and the start of the second section S2. It extends along the first path 10 to the via hole 455 located at the end of S2.

The second signal line 424 changes its position from the second path 20 to the first path 10 through the via hole 455 where the first section S1 starts, and then the second signal line 424 of the first section S1. It extends along the first path 10 to the via hole 455 located at the end. The second signal line 424 changes its position back to the second path 20 through the via hole 455 located at the end of the first section S1 and the start of the second section S2. The second hole 20 extends along the second path 20 to the via hole 455 positioned at the end of S2.

The first signal line 422 and the second signal line 424 almost overlap each other along the longitudinal direction, but do not overlap in the path changing unit PCP. That is, the first and second signal lines 422 and 424 move away from the paths 10 and 20 in opposite directions with respect to the paths 10 and 20 in the path change unit PCP, and the paths 10 and 20. ) And via holes 455 located away from each other to change positions. The first and second signal lines 422 and 424 whose positions are interchanged again extend along the changed paths 10 and 20 as they approach the paths 10 and 20 again. The planar shape of the portions of the first signal line 422 and the second signal line 424 positioned in the path change unit PCP may have a substantially rhombus shape.

The path changing part PCP of the differential signal line 420 and the path changing part PCP of the neighboring differential signal line 420 are located at different locations along the length direction. For example, the path change unit PCP of the leftmost differential signal line 420 indicated by 'A' in FIG. 2 may face a center portion of the first section S1 of the neighboring differential signal line 420.

If the path changing unit PCP and the via holes 455 of the neighboring differential signal lines 420 are arranged in a line without being interlaced with each other, the path changing units PCP and the via holes 455 may function as loop antennas. As a result, EMI characteristics may deteriorate.

Meanwhile, as shown in FIG. 4, the base plate 451 may have a double layer structure including an upper layer 451a and a lower layer 451b. In this case, the first path 10 is located in the upper layer 451a and the second path 20 is located in the lower layer 451b. A plurality of via holes 455 are formed in the upper layer 451a. The other structure is substantially the same as the structure shown in FIGS. 2 and 3.

Next, a circuit board according to another embodiment of the present invention will be described in detail with reference to FIGS. 5 to 7. The circuit board according to the present embodiment may be applied not only to the display device described above but also to other devices using the circuit board.

5 is a partially enlarged plan view of a circuit board according to another embodiment of the present invention, FIG. 6 is an enlarged view of a portion B of FIG. 5, and FIG. 7 is an exploded perspective view of a circuit board according to another embodiment of the present invention.

5 and 6, the circuit board 450 includes a base plate 451 and a plurality of differential signal lines 520.

The base plate 451 may be made of phenol resin or epoxy resin, and may have flexibility when the base plate 451 is moved or requires bending. The base plate 451 may be formed of a single layer.

A plurality of differential signal lines 520 are also formed on the base plate 451. One differential signal line 520 includes a first signal line 522 and a second signal line 524. The first signal line 422 and the second signal line 424 each include a portion placed in the first path 10 and a portion placed in the second path 20 and transmit signals having the same amplitude and opposite phases. . Here, the first path 10 is located on the top surface of the base plate 451, and the second path 20 is located on the bottom surface of the base plate 451. When the first path 10 is projected onto the lower surface of the base plate 451 where the second path 20 is located, these two paths 10 and 20 are separated from each other without overlapping each other.

The base plate 451 includes a plurality of via holes 455 formed along two paths 10 and 20. The via holes 455 are disposed in pairs at portions where the first and second signal lines 522 and 524 intersect with each other so that the path changes. The path change unit PCP is repeatedly positioned along the length direction L of the differential signal line 520.

When the two adjacent via holes 455 along the longitudinal direction L of the differential signal line 520 are referred to as sections S1 and S2, the distances of the sections S1 and S2 may be the same, and each section may be the same. It may be different.

When the first signal line 522 moves along the longitudinal direction L, the portion placed in the first path 10 and the portion placed in the second path 20 alternately appear, and the second signal line 524 is also in the longitudinal direction. When moving along (L), the portion placed in the first path 10 and the portion placed in the second path 20 alternately appear. In the same period S1 and S2, the first signal line 522 and the second signal line 524 are positioned on opposite paths. The first signal line 522 and the second signal line 524 move to the top surface or the bottom surface of the base plate 451 through the via hole 455, and cross the paths 10 and 20 to cross each other. The planar shape of a portion where the first signal line 522 and the second signal line 524 intersect may be a cross.

Looking at the position of the first and second signal lines 522 and 524 along the direction of the second section S2 in the first section S1, and more specifically, the first signal line 522 has a first section S1. ) Is moved from the first path 10 to the lower surface of the base plate 451 through the via hole 455 where the starting point is located, and then bends toward the second path 20 to follow the first path along the second path 20. It extends to the via hole 455 located at the end of S1. In addition, the first signal line 522 is formed on the upper surface of the base plate 451 in the second path 20 through the via hole 455 positioned at the end of the first section S1 and the start of the second section S2. After the movement to the first path 10 is bent along the first path 10 extends to the via hole 455 located at the end of the second section (S2).

The second signal line 524 moves from the second path 20 to the top surface of the base plate 451 through the via hole 455 positioned at the start of the first section S1, and then toward the first path 10. It extends along the first path 10 to the via hole 455 located at the end of the first section S1. The second signal line 524 is a lower surface of the base plate 451 in the first path 10 through the via hole 455 positioned at the end of the first section S1 and the start of the second section S2. After the movement to the second path 20 is bent toward the via hole 455 located at the end of the second section (S2) along the second path (20).

The first signal line 522 and the second signal line 524 hardly overlap each other, but only partially overlap each other at the intersection portion of the path changing unit PCP. The shape of the intersection may be approximately cross.

The path changing part PCP of the differential signal line 520 and the path changing part PCP of the neighboring differential signal line 520 are located at different locations along the length direction. For example, the path changing part PCP of the leftmost differential signal line 520 indicated by 'B' in FIG. 5 may face the center of the first section S1 of the neighboring differential signal line 520.

If the path change unit PCP and the via holes 455 of the neighboring differential signal lines 520 are arranged in a line without being crossed with each other, the path change units PCP and the via holes 455 may function as loop antennas. As a result, EMI characteristics may deteriorate.

Meanwhile, as shown in FIG. 7, the base plate 451 may have a double layer structure including an upper layer 451a and a lower layer 451b. In this case, the first path 10 is located in the upper layer 451a and the second path 20 is located in the lower layer 451b. These two paths 10 and 20 do not overlap each other, and are spaced apart in a direction perpendicular to the length direction L of the differential signal line 520. A plurality of via holes 455 are formed in the upper layer 451a. The other structure is substantially the same as the structure shown in FIGS. 5 and 6.

Next, a circuit board according to another embodiment of the present invention will be described in detail with reference to FIGS. 8 to 10. The circuit board according to the present embodiment may be applied not only to the display device described above but also to other devices using the circuit board.

8 is an enlarged plan view of a portion of a circuit board according to another embodiment of the present invention, FIG. 9 is an enlarged view of a portion C of FIG. 8, and FIG. 10 is an exploded perspective view of a circuit board according to another embodiment of the present invention.

8 and 9, the circuit board 450 includes a base plate 451 and a plurality of differential signal lines 620.

The base plate 451 may be made of phenol resin or epoxy resin, and may have flexibility when the base plate 451 is moved or requires bending. The base plate 451 may be formed of a single layer.

A plurality of differential signal lines 620 are also formed on the base plate 451. The differential signal line 620 includes a first signal line 622 and a second signal line 624. The first signal line 622 and the second signal line 624 extend along the first to fourth paths 10, 20, 30, and 40, and transmit signals having the same amplitude and opposite phases.

The first path 10 and the third path 30 are located on the upper surface of the base plate 451 and are spaced apart from each other by a predetermined distance d. The second path 20 and the fourth path 40 are located on the lower surface of the base plate 451 and are spaced apart from each other by a predetermined distance d. The first path 10 and the second path 20 overlap each other, and the third path 30 and the fourth path 40 overlap each other.

The base plate 451 includes a plurality of via holes 455 positioned on the paths 10, 20, 30, and 40, and includes via holes 455 positioned on the first and second paths 10 and 20. The via holes 455 positioned on the third and fourth paths 30 and 40 face each other.

The path changing unit PCP is a portion in which the first and second signal lines 622 and 624 change paths 10, 20, 30, and 40 on the same side of the base plate 451, respectively. It appears repeatedly along the longitudinal direction (L).

The via hole 455 according to the present exemplary embodiment is separated from the path changing unit PCP unlike other embodiments described above. That is, the via hole 455 is positioned between two path changing units PCP adjacent in the longitudinal direction L of the differential signal line 520.

 When the two adjacent via holes 455 along the longitudinal direction L of the differential signal line 620 are referred to as sections S1 and S2, the distances of the sections S1 and S2 may be the same, and each section may be the same. It may be different.

The first signal line 622 and the second signal line 624 are alternately positioned in four paths 10, 20, 30, and 40 when moving along the longitudinal direction L, and the first signal line in the same section S1 and S2. 622 and the second signal line 624 are located on different paths. The first signal line 622 and the second signal line 624 move through the via holes 455 to the paths 10 and 30 on the upper surface of the base plate 451 or the paths 20 and 40 on the lower surface. Also, the path change unit PCP changes the paths 10, 20, 30, and 40. The planar shape of portions of the first signal line 622 and the second signal line 624 in the path change unit PCP may be cross.

Looking at the position of the first and second signal lines 622 and 624 along the direction of the second section S2 in the first section S1, and more specifically, the first signal line 622 has a first section S1. ) Is moved from the first path 10 to the second path 20 through the via hole 455 where it starts, and then extends along the second path 20 to the path changing part PCP. The PCP is bent toward the fourth path 40 and extends along the fourth path 40 to the via hole 455 located at the end of the first section S1. The first signal line 622 moves from the fourth path 40 to the third path 30 through the via hole 455 located at the end of the first section S1 and the start of the second section S2. Subsequently, it extends along the third path 30 to the path change unit PCP, and is then bent toward the first path 10 by the path change unit PCP and ends at the end of the second section S2 along the first path 10. The via hole 455 extends.

The second signal line 624 moves from the fourth path 40 to the third path 30 through the via hole 455 located at the start of the first section S1 and then along the third path 30. It extends to the change part PCP and then extends from the path change part PCP toward the first path 10 and extends along the first path 10 to the via hole 455 located at the end of the first section S1. The second signal line 624 moves from the first path 10 to the second path 20 through the via hole 455 located at the end of the first section S1 and the start of the second section S2. The second path 20 extends along the second path 20 to the path change unit PCP, and then, at the end of the second section S2 along the fourth path 40 by bending toward the fourth path 40 from the path change unit PCP. The via hole 455 extends.

The first signal line 622 and the second signal line 624 hardly overlap each other, but only partially overlap each other at the intersection of the path change unit PCP. The shape of the intersection may be approximately cross.

The path changing part PCP of the differential signal line 620 and the path changing part PCP of the neighboring differential signal line 620 are located at different locations along the length direction. Therefore, the via hole 455 of the differential signal line 620 does not face the via hole 455 of the neighboring differential signal line 620. In addition, the path change unit PCP of the via hole 455 of the differential signal line 620 and the neighboring differential signal line 620 may also be located at different locations along the longitudinal direction of the differential signal line 620.

If the path change unit PCP and the via holes 455 of the neighboring differential signal lines 620 are not arranged alternately with each other, the path change units PCP and the via holes 455 function as loop antennas. This can lead to poor EMI characteristics.

Meanwhile, as shown in FIG. 10, the base plate 451 may have a double layer structure including an upper layer 451a and a lower layer 451b. In this case, the first path 10 and the third path 30 are located in the upper layer 451a, and the second path 20 and the fourth path 40 are located in the lower layer 451b. A plurality of via holes 455 are formed in the upper layer 451a. The other structure is substantially the same as the structure shown in FIGS. 8 and 9.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

1 is a perspective view of a display device according to an embodiment of the present invention,

FIG. 2 is a partially enlarged plan view of the circuit board shown in FIG. 1;

3 is an enlarged view of a portion A of FIG. 1;

4 is an exploded perspective view of a circuit board according to another embodiment of the present invention;

5 is a partially enlarged plan view of a circuit board according to another embodiment of the present invention;

FIG. 6 is an enlarged view of a portion B of FIG. 5;

7 is an exploded perspective view of a circuit board according to another embodiment of the present invention;

8 is a partially enlarged plan view of a circuit board according to another embodiment of the present invention;

FIG. 9 is an enlarged view of portion C of FIG. 8;

10 is an exploded perspective view of a circuit board according to another embodiment of the present invention.

≪ Description of reference numerals &

10, 20, 30, 40: path of differential signal lines

60: cover 80: light source

100: lower substrate 200: upper substrate

300: display panel portion 420, 520, 620: differential signal line

450: circuit board 451, 452: substrate

455: via hole 510: flexible printed circuit film

Claims (19)

Desktop, and Multiple differential signal lines formed on the base plate and carrying differential signals / RTI > Each of the plurality of differential signal lines includes a first signal line and a second signal line, The first signal line and the second signal line extend along at least two paths parallel to each other; The first signal line and the second signal line change paths in a path changing unit; Path change parts of the neighboring differential signal lines are located at different locations along the length direction of the differential signal line. Circuit board. The method of claim 1, The base plate includes a first side and a second side, The at least two paths include a first path located on the first surface and a second path located on the second surface, The first signal line is located on the first path on one side and on the second path on the other side of the path changing unit. The second signal line is located on a path opposite to the first signal line. Circuit board. 3. The method of claim 2, The base plate includes a pair of via holes located in the path change unit, And the first signal line and the second signal line reroute from the first path to the second path through the pair of via holes. 4. The method of claim 3, The circuit board overlaps the first path and the second path. 5. The method of claim 4, And the pair of via holes are spaced apart from the first path and the second path. The method of claim 5, The pair of via holes spaced apart from each other with respect to the first and second paths and facing each other. The method of claim 6, The planar shape of the portion of the first signal line and the second signal line positioned in the path changing part is a rhombus. 4. The method of claim 3, And the first path and the second path are spaced apart from each other by projecting the first path onto the second surface of the base plate. 9. The method of claim 8, The pair of via holes are located on the first path and the second path, respectively. The first signal line and the second signal line cross each other at the path changing unit. Circuit board. The method of claim 9, And a planar shape of the first signal line and the second signal line part positioned in the path changing part is a cross. 11. The method of claim 10, And the path changing part of the differential signal line faces a central part of a section between two adjacent path changing parts of a neighboring differential signal line. In claim 1, The base plate is First and second sides, and A plurality of via holes spaced apart from the path changing part in a longitudinal direction of the differential signal line / RTI > The at least two paths are A first path located on the first surface, A second path located on the second surface and overlapping the first path, A third path located on the first surface and spaced apart from the first path, and A fourth path located on the second surface and overlapping the third path Including, The first signal line is changed from the first path to the third path while passing through the path changing unit, and is changed from the third path to the fourth path at the via hole. The second signal line in the same section as the first signal line is changed from the fourth path to the second path while passing through the path changing unit, and is changed from the second path to the first path at the via hole. Circuit board. The method of claim 12, The first signal line and the second signal line intersect at the path changing unit; The planar shape of the first signal line and the second signal line part positioned in the path changing part may be a cross. Circuit board. The method of claim 13, Via holes corresponding to two neighboring differential signal lines on the same surface of the base plate may be located at different positions along the length direction of the differential signal line. Circuit board. The method of claim 14, Path change parts and via holes corresponding to two neighboring differential signal lines on the same surface of the base plate may be located at different positions along the length direction of the differential signal line. Circuit board. In claim 1, The base plate is composed of a double layer including an upper layer and a lower layer, The at least two paths include a first path located above the upper layer and a second path located above the lower layer, The first signal line is located on the first path on one side and on the second path on the other side of the path changing unit. The second signal line is located on a path opposite to the first signal line. Circuit board. 17. The method of claim 16, The upper layer includes a pair of via holes located in the path change unit, And the first and second signal lines reroute from the upper layer to the lower layer through the pair of via holes. In claim 1, And the base plate and the differential signal line have flexibility. A circuit board as defined in any one of claims 1 to 18, A gate and data driving integrated circuit chip receiving a signal from the circuit board, and A display panel including a plurality of thin film device structures on a substrate, and receiving signals from the gate and data driving integrated circuit chips. .

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